Sheikh `Abdus-Sattaar Fathallah As-Sa`eed, Professor of Qur’an Exegesis at Al-Azhar University, states the following: “There is a big difference between Islamic banks and non-Islamic banks. The latter engages in Riba-based deals on a constant basis in the sense that it gives and takes loans with interest charges. This is strictly condemned in Islamic law. The former does not.
The Prophet (peace and blessings be upon him) cursed anyone who became in any way involved in Riba, either by taking it, paying it, utilizing it, or by being witness to it. He considered each one of them as a party to this sinful conduct.
Islamic banks do not and have never dealt with Riba. This is the norm, and it is uncompromised. That is why the whole system is put under strict and constant supervision.
However, one may notice some Riba-based practices carried out by these banks. This is due to the faults of bank employees or pressure, which some states put on the bank. But all this does not the change the nature of banks as purely Islamic financial institutions where Riba is forbidden.
Thus, if you are sure that the banks you mention are really Islamic, then you can deal with them rather than dealing with non-Islamic banks that indulge in Riba.”